Process of producing vat dyestuff prints and closely adjacent thereto aniline black prints on the same fabric



Patented Aug. 15, 1933 1 PROCESS OF PRODUCING VAT DYESTUFF PRINTS AND CLOSELY ADJACENT THERE- TO ANILINE BLACK PRINTS ON THE SAME FABRIC Ernst Pfeffer, Frankfor't-on-the-Main-Schwanheim, Germany, assignor to General Aniline Works, Inc., New York, N. Y., a Corporation of Delaware v No Drawing. Application May 7, 1929, Serial No.

361,260, and in Germany May 16, 1928 4 Claims. 8-5) The present invention relates to a process of which can be produced on the fiber by oxidation. producing vat dyestufi prints and closely adja- Thus the tints of aniline black can be var ed. cent thereto aniline black prints on the same The following examples illustrate my invenfabric. 7 tion:

In practice it is diflicult to produce vat dyestuii The constituents are composed as follows: 60 prints and closely adjacent thereto aniline black Example 1 prints on the same fabric because, for printing purposes, the aniline black preparatio is used Printing color for vat dyestufis Printing color for aniline black in an acid state and the vat dyestuif preparation in an alkaline state and these two difierent print- 100 g of the yenow vat dyestufl 84 of aniline Sam 65 mg colors detrimentally affect one another when pre pared according 13o 60302l1jg18 11 M 4 applied to the fabric in designs which either overg;,-;, ggigf g g: a 55335 lap or run closely adJacent to each other. More- 3 a 0g ga e: M a of y potassium over, in order to fix the vat dyestufi, it is neces- 6 t 5333; sary to steam the material for 5 minutes in a 1000 1000 steam ager (Mather-Flatt). In consequence of rennin:airin ;leanings table fiber is considerably weakened by the acid 2 3i E 2223 cellulose are added to constituents of the aniline black printing preparation.

Now I have found that it is possible to produce 1000 grams vat dyestuii prints and closely adjac t th t The methyl cellulose dissolves in water when the aniline black prints on the same fabric by promixture C0015 doWII- ceeding in the following manner: The material The two printing Colors are ppl d to the mais printed in separate designs with a printing terial in separate designs and the material is paste com ri in an aniline black preparation then steamed for 1 minute in the Mather-Flatt and with anoth printing paste comprising a at 95 C. and subsequently padded in the followvat dyestufi' and thickening agent capable of ing solution for the purpose of fixing the vat dyebeing precipitated by an alkali, such as cellulose Stuff:

esters or cellulose ethers which are soluble in cold 100 of hydrosulfite concentrated p wder water or mucilaginous substances, for instance 747 of cold Water carrageen, or a mixture of such thickening agents 150 of caustic Soda Solution of as are capable of being precipitated by an alkali 3 of awefiting agent with known thickening agents, such as starch or v flour, the vat dyestufi printing paste, however, 1 liter containing no alkali and no reducing agent The The next following operations consist in steamprinted material is then steamed for a short time mg the material Without drying in a roller or exposed to air in order to oxidize the aniline P f about 15 Q F f about 950 black color. The material is further treated with P ll acldlfymg again rinsing and a reducing solution, for instance an alkaline hysoapmg at bollmg temperature drosulfite solution in order to fix the vat dyestulf, Example 2 and finally steamed for a short time without previous drying The vat dyestufis thus applied The constituents are composed as follows:

f. along with the aniline black can be printed in a Printing color for vat d estufis P I f b i v r a neutral or weakly acidified state and, therefore, y m mg 00 or Dram me labk do no longer detrimentally affect the aniline black 100 .of the ellow vatd estuff 84 f 1' b printing colors, on the other hand the aniline g prep red accordin to tfififiiifii ck U.S. Patent No. l 564,- 600 g. of carra ecu thicken black belngfldfevel'oped Is not f' by 584 of December 8, 1925 25 g. of sodiu m chlorate mg a the operation of nx ng the vat dyestufi winch re- 0 cof water 50 a o ye w po si erquires y a Short steaming. 600g. olearrageen th1cken1ng 236 g. ofiggyt glnide Furthermore, it is possible by my new process 1000 1 to print the material with a mixture of a vat 000g' 5 dyestufi and aniline black or another dyestuff Carrageen thickening:

50 g. of carrageen are thoroughly boiled with 950 g. of water for 4 hours while replenishing the evaporated water and the whole is made up to The printing colors are applied to the material and the printed material is treated as indicated in Example 1.

I claim: 7

1. The process of producing vat dyestuff prints and closely adjacent thereto aniline black prints on the same fabric, which comprises printing the material in separate designs with a printing paste comprising an aniline black preparation, and with another printing paste comprising a vat dyestuff and a thickening agent capable of being precipitated by an alkali, but containing no alkali and no reducing agent, then developing. the aniline black, by shortly steaming the material, and thereupon fixing the vat dyestufi by treating the material in an alkaline bath containing a reducing agent, and subsequently steaming the material thus treated.

2. The process of producing vat dyestuff prints and closely adjacent thereto aniline black prints on the same fabric, which comprises printing the material in separate designs with a printing paste comprising an aniline black preparation, and with another printing paste comprising a vat dyestuff and as a thickening agent an organooxy derivative of cellulose capable of being precipitated by an alkali but containing no, alkali and no reducing agent, then developing the a reducing agent, and subsequently steaming the material thus treated.

3. The process of producing vat dyestufi prints and closely adjacent thereto aniline black prints on the same fabric, which comprises printing the material in separate designs with a printing paste comprising an aniline black preparation, and with another printing paste comprising a vat dyestufl' and as a thickening agent a cellulose ether capable of being precipitated by an alkali, but containing no alkali and no reducing agent, then developing the aniline black by shortly steaming the material, and thereupon fixing the vat dyestufi by treating the material in an alkaline bath containing a. reducing agent, and subsequently steaming the material thus treated.

4. The process of producing vat dyestuff prints and closely adjacent thereto aniline black prints on the same fabric, which comprises printing the material in separate designs with a printing paste comprising an aniline black preparation, and with another printing paste comprising a vat dyestuff and methyl cellulose soluble in cold water and capable of being precipitated by an alkali, but containing no alkali and no reducing agent then developing the aniline black by shortly steaming the material, and thereupon fixing the vat dyestuff by treating the material in an alkaline bath containing hydrosulfite, and subsequently' steaming the material thus treated without any intermediate drying.

ERNST PFEFFER. 

